Check out this list of 101 preschool social skills for kids with autism.
According to the DSM V, this is how autism is currently diagnosed. This will give you an idea of characteristics of autism. If you feel your child might have autism, contact your doctor.
Great list of preschool movement songs for circle time, brain breaks, or home.
Sink or Float is a fun preschool science experiment for everyone. Can be adapted to different levels of learning.